Path: utzoo!dptcdc!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!osu-cis!sppy00!jmv
From: jmv@sppy00.UUCP (Jim Vickroy)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Question 1 of 3 for assembly language programmers.
Keywords: Is there an equivalent to argc,argv in ass'y?
Message-ID: <294@sppy00.UUCP>
Date: 18 Apr 89 14:40:17 GMT
References: <4496@tekigm2.MEN.TEK.COM>
Reply-To: jmv@sppy00.UUCP (Jim Vickroy)
Distribution: na
Organization: Online Computer Library Center, Dublin, Ohio.
Lines: 41

In article <4496@tekigm2.MEN.TEK.COM> alanr@tekigm2.MEN.TEK.COM (Alan Rovner) writes:
=>
=>Can I access DOS command line arguments through assembly language?
=>This would be the equivalent to using argc and argv in C.  I would
=>appreciate a short example if possible.

Yes you can. The command line parameters are passed to you through the PSP,
specifically at offset 81 hex. Located at offset 80 hex is a byte which is
the length of the parameter string. The command line is delivered intact:

    If you launched a program:

	    MYPROG -a -b -cde filename

    the PSP would contain this information:

	    Offset	Contents
	    =======	=========================================
	    80h		13h
	    81h-94h	"-a -b -cde filename" (excluding the "'s)

Sorry, I don't have source right here to include. If you have problems,
e-mail a request and I'll try to round up the appropriate code segment..

Good luck....


jim
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